Slides from the GPS World webinar “Defense PNT in Challenged Environments” hosted on June 21, 2018, and presented by Jon Fischer and Jon Sinden. This webinar discusses the reliance of GPS in modern land-warfare systems, the potential effects of GPS disruption on their operation and considerations for protecting their ability to continue operating in a GPS-disrupted environment. View the slides presented by Orolia or click here to register and watch the webinar on demand.